Electrical Machines

Electrical Machines Electrical Machines are the machines that required electrical energy for their operation. These machines may be ac or dc (means what kind of supply requires for their operation). The ac machines are two types static and rotating machines. On the other hand dc machines are only rotating one. In this article we will […]

EMF Equation for Transformer For drive an emf equation for transformer we will consider the case of an ideal transformer. An ideal transformer one which have no copper loss(I2R losses) and magnetic leakage flux. In other words, we can say that an ideal transformer consists of windings which have zero ohmic resistance and loss-free core. […]

Transformer on Load When some load is connected across the secondary of the transformer, then it is said to be transformer on load. The current I2 flows through load and secondary winding. The magnitude of current I2 depends upon the terminal voltage V2 and impedance of load. The angle between current I2 and voltage V2 […]

EMF Equation for DC Machine DC machine may be either works as a dc motor or dc generator. EMF equation is important for both. In case of DC generator an induced emf is called generated emf and in case of DC motors generated emf is called Back or Counter emf The DC generator is rotate […]

Parallel Operation of Alternators When the number of smaller units is connected in parallel instead of installing a large unit is called parallel operation of alternators. There are numbers of reasons, connecting alternator in parallel such as cost become less, maintenance and repair, efficiency and reliability of the power system. All the alternator of the […]

DC Motor DC motor is a electrical machine which converts electrical energy into mechanical. There are three types of dc motors which are employed at various industrial applications. The dc motors are classified on the basis of connection of field winding with respect to armature. Most important application of dc motor found in traction system. […]

DC Generator DC Generator is an electrical machine that converts mechanical energy into electrical energy. It is usually driven by some source of mechanical power which may be a diesel or petrol engine, steam turbine etc. Working Principle of Generator The working principle of dc generator based on the dynamically induced emf. It states that […]

Characteristics of DC Series Motors The performance of DC motor can observe by its operating characteristics curve is called motor characteristics. In this article we will discuss about characteristics of DC series motors. Speed Armature Current (N-Ia) Characteristics The speed of a dc series motor given by the relation. Where is back emf and its […]

Characteristics of DC Shunt Motors In case of dc shunt motors, for constant supply voltage, the field current is constant. Hence, the flux in dc shunt motors is practically constant. In this article,we will discuss about various characteristics of dc shunt motor. Speed Current (N-Ia) Characteristics The speed of dc motor is directly proportional to […]

Applications of Synchronous Motor Synchronous motor is constant speed motor. This motor is not used for drive heavy load. In this topic we will discuss about various applications of synchronous motor. The Synchronous motors are used for various purposes which are given below:- The synchronous motors are used in power houses and electrical substations in […]